CN105625572A - Prefabricated prestressed concrete frame beam-column joint making disparate use of high performance materials - Google Patents
Prefabricated prestressed concrete frame beam-column joint making disparate use of high performance materials Download PDFInfo
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- CN105625572A CN105625572A CN201610113823.4A CN201610113823A CN105625572A CN 105625572 A CN105625572 A CN 105625572A CN 201610113823 A CN201610113823 A CN 201610113823A CN 105625572 A CN105625572 A CN 105625572A
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- concrete
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- watering
- column node
- bean column
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/22—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material with parts being prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
Abstract
The invention discloses a prefabricated prestressed concrete frame beam-column joint making disparate use of high performance materials, comprising prefabricated concrete beams, prefabricated concrete columns, prefabricated beam-bottom prestressed tendons, common rebars, beam-top common rebars, in-column vertical rebars, sleeves, connecting rebars, and U-shaped rebars. Post-cast sections are reserved at two ends of the pre-fabricated beams, and the prestressed tendons fitted to the bottom of the prefabricated beams extend out of beam ends and are anchored to the beam-end post-cast sections, forming the prefabricated concrete beam-column joint with the prefabricated concrete beams and columns through post-cast concrete. In order to ensure the integrity of the beam-column joint, the beam-bottom common stressed rebars are connected with aseismic rebars through the sleeves and the U-shaped rebars are disposed in a joint post-cast area. In order to improve the energy dissipating capacity of the beam-column joint, the two ends of the prefabricated beams are made by casting high ultimate strain concrete. The invention reduces the production and construction difficulty, decreases the section height or steel usage of the prefabricated concrete beams and ensures the integrity and aseismic performance of the beam-column joint.
Description
Technical field
The present invention relates to the precast prestressed concrete frame beam-column joint connecting structure that a kind of distinctiveness uses high performance material, belong to civil engineering work precast concrete technical field.
Background technology
Skeleton construction becomes primarily of beam, post and bean column node build, and belongs to a kind of structure formation most widely used in construction work. Precast prestressed concrete prefabricated integral frame structural system meets the requirement of " building industry, housing industrialization " and green building. Such structural system has that speed of application is fast, environmental pollution is little, quality is guaranteed and the advantage such as good endurance, also has and is convenient to adopt the outstanding features such as first tension prestress technology, member section reduce, node construction is comparatively easy, steel using amount is lower.
The core technology of precast prestressed concrete prefabricated integral frame structure is the Joint's connection fabrication form of precast concrete beam and precast concrete column, and its quality directly has influence on the ultimate bearing capacity and anti-seismic performance etc. of this class formation. Beam-ends is provided with keyway or U shape groove by current existing pre-fabricated one bean column node interconnection technique, it be furnished with presstressed reinforcing steel and regular reinforcement simultaneously, sometimes U-shaped reinforcing bar it is aided with, mutually overlap, it be anchored in joint cores, and the section of watering adopts concrete cast-in-situ that precast concrete beam, post are formed an entirety behind node area, but have that cost is relatively big, construction operation space not enough, the ductility of joint performance deficiency such as shortcoming to some extent. Above precast frame bean column node interconnection technique has suitability deficiency more, the problems such as inconvenience are built in construction, and this makes the application advantage of precast prestressed concrete prefabricated integral frame structure and not obvious.
How to build that stress performance is good, construction measure rationally, construction novel beam-column joint connecting structure easily, be the technological difficulties of precast prestressed concrete prefabricated integral frame structure always.
Summary of the invention
Technical problem: the present invention provides and a kind of manufactures that difficulty is low, convenient, the type of attachment of constructing is simple, use the precast prestressed concrete frame bean column node of high performance material by the distinctiveness that power is clear and definite.
Technical scheme: the distinctiveness of the present invention uses the precast prestressed concrete frame bean column node of high performance material, comprise the section of watering after bean column node, it is arranged on the precast concrete beam at the horizontal two ends of the section of watering after described bean column node, it is arranged on the precast concrete column at the upper and lower two ends of the section of watering after bean column node, it is provided with cast-in-place region, superimposed beam top above the section of watering after described precast concrete beam and bean column node, the section of watering is furnished with after described bean column node U shape reinforcing bar and is positioned at the connection reinforcing bar on the downside of U shape reinforcing bar, longitudinal reinforcing bar it is furnished with in described precast concrete column, described superimposed beam top is furnished with common steel bar stress in cast-in-place region, the bottom of precast concrete beam is furnished with common steel bar stress and presstressed reinforcing steel, described presstressed reinforcing steel stretch out beam-ends and stretch into bean column node after the section of watering, formation crotch is upwards bent up along post direction, it is anchored in after bean column node in the section of watering, described common steel bar stress by joint sleeve be connected bar connecting, the section of watering is cast with after bean column node the high-performance concrete material that compressive ultimate strain is more than or equal to normal concrete compressive ultimate strain 1.2 times.
Further, in bean column node of the present invention, after bean column node in the section of watering, the grade of U shape reinforcing bar converts by force area AS convertsFor 0.2A 's��A 's, wherein A 'sFor the total cross-sectional area of common steel bar stress, AS convertsTotal cross-sectional area A according to the U shape reinforcing bar being furnished with in the section of watering after bean column nodesThrough waiting strong conversion to obtain;
The section area A of described connection reinforcing barseFor 0.2A 's��0.8A 's��
Further, in bean column node of the present invention, the length in reserve of the section of watering after described bean column node, namely the horizontal spacing of precast concrete column edge and precast concrete beam end is 0.5h��2h, wherein h is the height of superimposed beams of concrete, i.e. the height sum in the cast-in-place region of precast concrete beam and superimposed beam top.
Useful effect: compared with prior art, the present invention has the following advantages:
(1) the common steel bar stress of configuration in conventional precast concrete beam, the span ability of beam is poor, in order to improve span ability, presstressed reinforcing steel and common steel bar stress it is furnished with in precast prestressed concrete beam, to meet the control overflow such as the crack of beams of concrete, tensile stress, causing component cost higher, in effective cast-in-place construction space, connection and the construction operation difficulty of node region are very big. And in the present invention precast beam two ends leave after the section of watering, only need additional configuration U shape reinforcing bar, and the common steel bar stress of both sides is effectively connected, reach the supporting capacity equal with onsite concrete skeleton construction and anti-seismic performance, reduce beam section or the steel using amount of precast beam, thus the cost of component, difficulty of construction significantly reduce, reach the object of meterial saving and high efficiency.
(2), when steel bar stress is interconnected in tradition precast concrete beam, adopts welding or colligation to connect, all there are some shortcomings. Colligation connects and easily causes Joint failure, and narrow space operation easier is big, and the equipment volume being welded to connect is relatively big, and mobile inconvenience, joint qualification rate are low, and the technical requirements of operation workman is higher, and in operation, welding quality affects bigger by workman's state of the art. The present invention adopts the sleeve that can connect different diameter and connect reinforcing bar. Therefore, this technology reduces the complicacy that in territory, precast concrete beam column node core area, steel bar stress connects on the one hand, be conducive to the reliable connection between steel bar stress bottom beam, also significantly reduce on the other hand making, the production difficulty of precast concrete beam, it is to increase the convenience of site operation and high efficiency.
(3) connection at precast concrete bean column node place is more weak usually, node anti-seismic performance is poor, and the present invention is configured with U shape reinforcing bar at the two ends of precast beam and position, joint core region, whole in the section of watering after coexisting with the common steel bar stress in interconnective bottom one water formation bean column node, under the prerequisite of the globality and anti-seismic performance that ensure bean column node, this connecting structure is comparatively simple, clear and definite by power.
(4) easily there is plastic hinge in precast concrete frame joint region, and during cast normal concrete, the energy dissipation capacity of node is comparatively not enough. The present invention the two ends of precast concrete beam reserved respectively certain after water region, and cast has the high performance concrete of relatively high limit strain wherein, compares normal concrete bean column node, and the ductility of its beam-ends plastic hinge region is improved preferably.
Accompanying drawing explanation
Fig. 1 is the precast prestressed concrete frame bean column node connection diagram of the distinctiveness use high performance material of the present invention.
Fig. 2 is the sectional view in the cast-in-place region of precast concrete beam and superimposed beam top in Fig. 1.
Wherein: 1 is precast concrete beam, 2 is the cast-in-place region, top of superimposed beam, and 3 is common steel bar stress bottom precast beam, and 4 is precast concrete column, 5 is joint sleeve, 6 is the section of watering after precast concrete bean column node, and 7 is presstressed reinforcing steel bottom precast beam, and 8 is U shape reinforcing bar, 9 is longitudinal reinforcing bar in prefabricated post, 10 is the common steel bar stress at precast beam top, and 11 for meeting the connection reinforcing bar that antidetonation requires, 12 is stirrup.
Embodiment
Below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described further:
A kind of distinctiveness that Fig. 1 is the present invention uses the precast prestressed concrete frame bean column node of high performance material to illustrate, and Fig. 2 correspond to the sectional view in the cast-in-place region of precast concrete beam and superimposed beam top in Fig. 1. As shown in Figure 1 and Figure 2, distinctiveness uses a precast prestressed concrete frame bean column node for high performance material, primarily of reinforcing bar 9 longitudinal in presstressed reinforcing steel 7, U shape reinforcing bar 8, prefabricated post bottom the section of watering 6, precast beam after the bean column node at common steel bar stress 3, precast concrete column 4, joint sleeve 5, precast beam two ends bottom precast concrete beam 1, cast-in-place region, superimposed beam top 2, precast beam, the common steel bar stress 10 in precast beam top, the connection reinforcing bar 11 that meets antidetonation and require. The section of watering 6 after the two ends of described precast concrete beam 1 are reserved, regular reinforcement 3 and presstressed reinforcing steel 7 it is furnished with bottom precast beam 1, wherein presstressed reinforcing steel 7 stretches out beam-ends and by, after the section of watering after bean column node 6, upwards bending up formation crotch along post direction, is anchored in after bean column node in the section of watering 6.
As shown in Figure 1, the diameter of the steel bar stress 3 that the two ends of described joint sleeve 5 connect and anti-seismic steel bar 11 can not be identical. The tensile bearing capacity standard value of described sleeve 5 should be greater than, equal 1.1 times that are connected the tension standard value of bearing capacity of reinforcing bar 3 and anti-seismic steel bar 11, and the length of sleeve 5 is 2��15 times of the diameter of reinforcing bar 3 and reinforcing bar 11.
Distinctiveness described in Fig. 1 uses the precast prestressed concrete frame bean column node of high performance material, U shape reinforcing bar 8 should be set in the section of watering 6 after node, described U shape reinforcing bar 8 two ends upwards bend up in U-shape, make precast concrete beam 1, precast concrete column 4 connect into as a whole better. For guaranteeing equal strength design, material, the strength grade of the U shape reinforcing bar 8 being furnished with are identical with common steel bar stress 3, and the total cross-sectional area A of described U shape reinforcing bar 8 and the described connection reinforcing bar 11 meeting antidetonation requirementsBy waiting area A after the area being converted into by force back regular reinforcementS convertsFor 0.2A 's��A 's, wherein A 'sFor the total cross-sectional area of the common steel bar stress 9 in back portion. Herein, when waiting strong conversion to refer to that different grade of steel reinforcing bar replaces, the principle equal by intensity replaces, and need to consider the strength failure criterion of different reinforcing bar. The anchorage length of U shape reinforcing bar 8 and thickness of concrete cover should meet the relevant regulatory requirements of national existing industry standard and national regulation. The described section area A meeting the connection reinforcing bar 11 that antidetonation requiresseFor 0.1A 's��0.5A 's, its radical is identical with regular reinforcement 3.
Need to point out, Fig. 1 is connected with sleeve 5 and meets connection reinforcing bar 11 that antidetonation requires and U shape reinforcing bar 8 not only should meet the related performance indicators requirement of regular reinforcement, also need to meet three requirements of antidetonation aspect, that is: the actual measurement tensile strength of reinforcing bar 11, reinforcing bar 8 is not less than 1.25 with the ratio of actual measurement yield strength, the actual measurement yield strength of reinforcing bar 11 and reinforcing bar 8 is not more than 1.30 with the ratio of common hot-rolled reinforced bar characteristic strength value, and under the maximum, force of reinforcing bar 11 and reinforcing bar 8, total elongation is not less than 9%. When the height of precast concrete beam 1 is higher, the both sides of beam should arrange waist muscle, and stirrup 12 should adopt closed stirrup. The distribution of reinforcing bar 3 and presstressed reinforcing steel 7 at the bottom of beam should disperse, symmetry; Its anchorage length and thickness of concrete cover should meet the relevant regulatory requirements of national existing industry standard and national regulation.
As shown in Figure 1, being cast with high-performance concrete material after the bean column node of described precast beam 1 in the section of watering 6, its compressive ultimate strain is more than or equal to 1.2 times of normal concrete compressive ultimate strain. After described precast beam two ends bean column node, the length in reserve of the section of watering 6 adopts 0.5h��2h, and wherein h is the height of superimposed beams of concrete. Owing to plastic hinge easily occurs in precast concrete frame joint region, during cast normal concrete, the energy dissipation capacity of node is comparatively not enough. The present invention the two ends of precast concrete beam reserved respectively certain after water region, and cast has the concrete of relatively high limit strain wherein, compares normal concrete bean column node, and the ductility of its beam-ends plastic hinge region is improved preferably.
Precast beam 1 and prefabricated post 4 first set up temporary support, template etc. before lifting, and regulate according to design requirements and support height, accurate to guarantee the position of precast concrete beam 1 and precast concrete column 4. During site operation, the post-cast strip 6 at precast concrete beam 1 two ends is provided with template, by reinforcing bar 9 installation longitudinal in the presstressed reinforcing steel 7 bottom beam, the common steel bar stress 10 in top, stirrup 12 and post, as shown in Figure 2, and adopt concrete to build simultaneously, form precast concrete bean column node.
Below schematically the present invention and enforcement mode thereof being described, this description does not have restricted, is one of embodiments of the present invention shown in accompanying drawing 1 Fig. 2. When mode of connection disclosed in the present invention be applied to more generally pre-fabricated one bean column node time, can according to actual beam-to-column joint mode (as top layer side column, top layer center pillar, layer side column etc.), the U shape reinforcing bar of the section of watering after node region, sleeve, presstressed reinforcing steel radical and distribution form are appropriately adjusted. Therefore, if others skilled in the art are not when departing from the invention objective, adopt the component mode of connection similar to this technical scheme and embodiment, protection scope of the present invention all should be belonged to.
Claims (3)
1. the precast prestressed concrete frame bean column node of a distinctiveness use high performance material, it is characterized in that, this node comprises the section of watering (6) after bean column node, it is arranged on the precast concrete beam (1) at the section of watering (6) horizontal two ends after described bean column node, it is arranged on the precast concrete column (4) at the two ends up and down of the section of watering (6) after bean column node, after described precast concrete beam (1) and bean column node, the section of watering (6) top is provided with cast-in-place region, superimposed beam top (2), the section of watering (6) is furnished with after described bean column node U shape reinforcing bar (8) and is positioned at the connection reinforcing bar (11) of U shape reinforcing bar (8) downside, longitudinal reinforcing bar (9) it is furnished with in described precast concrete column (4), cast-in-place region, described superimposed beam top (2) is furnished with common steel bar stress (10), the bottom of precast concrete beam (1) is furnished with common steel bar stress (3) and presstressed reinforcing steel (7), described presstressed reinforcing steel (7) stretch out beam-ends and stretch into bean column node after the section of watering (6), formation crotch is upwards bent up along post direction, it is anchored in after bean column node in the section of watering (6), by joint sleeve (5), reinforcing bar (11) connects described common steel bar stress (3) with being connected, the section of watering (6) is cast with after described bean column node the high-performance concrete material that compressive ultimate strain is more than or equal to normal concrete compressive ultimate strain 1.2 times.
2. distinctiveness according to claim 1 uses the precast prestressed concrete frame bean column node of high performance material, it is characterised in that, after described bean column node in the section of watering (6), the grade of U shape reinforcing bar (8) converts by force area AS convertsFor 0.2A 's��A 's, wherein A 'sFor the total cross-sectional area of common steel bar stress (10), AS convertsTotal cross-sectional area A according to U shape reinforcing bar (8) being furnished with in the section of watering after bean column node (6)sThrough waiting strong conversion to obtain;
The section area A of described connection reinforcing bar (11)seFor 0.2A 's��0.8A 's��
3. distinctiveness according to claim 1 uses the precast prestressed concrete frame bean column node of high performance material, it is characterized in that, the length in reserve of the section of watering (6) after described bean column node, namely the horizontal spacing of precast concrete column (4) edge and precast concrete beam (1) end is 0.5h��2h, wherein h is the height of superimposed beams of concrete, i.e. the height sum on precast concrete beam (1) and cast-in-place region, superimposed beam top (2).
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| CN201610113823.4A CN105625572B (en) | 2016-02-29 | 2016-02-29 | Distinctiveness uses the precast prestressed concrete frame bean column node of high performance material |
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| CN201610113823.4A CN105625572B (en) | 2016-02-29 | 2016-02-29 | Distinctiveness uses the precast prestressed concrete frame bean column node of high performance material |
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Cited By (12)
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| CN105926771A (en) * | 2016-06-17 | 2016-09-07 | 中国十七冶集团有限公司 | Middle joint connecting structure of assembled integral frame column-beam and construction method of middle joint connecting structure |
| CN106149878A (en) * | 2016-06-23 | 2016-11-23 | 宁波普利凯建筑科技有限公司 | Attachment structure at concrete frame structure prefabricated post and beam slab node and method |
| CN108019000A (en) * | 2018-01-24 | 2018-05-11 | 西安建筑科技大学 | A kind of high-strength high ductility concrete of assembled exempts from sleeve connection structure and connection method |
| CN108035438A (en) * | 2018-01-24 | 2018-05-15 | 西安建筑科技大学 | A kind of concrete assembled frame structure system of high-strength high ductility and connection method |
| CN106149877B (en) * | 2016-06-23 | 2018-06-05 | 宁波普利凯建筑科技有限公司 | Concrete frame structure prefabricated post and the docking structure and method at beam slab node |
| CN108265824A (en) * | 2018-01-24 | 2018-07-10 | 西安建筑科技大学 | A kind of high ductility concrete beam and column node of assembled and connection method |
| CN108661171A (en) * | 2018-07-03 | 2018-10-16 | 江苏南通二建集团有限公司 | A kind of prefabricated assembled concrete frame joint connection structure |
| CN108755929A (en) * | 2018-06-22 | 2018-11-06 | 重庆大学 | A kind of assembled pre-tensioned prestressed concrete frame and its construction technology |
| CN108824637A (en) * | 2018-05-23 | 2018-11-16 | 王昆 | A kind of precast prestressed assembled beam-column node |
| CN108867858A (en) * | 2018-06-08 | 2018-11-23 | 中国建筑股份有限公司 | Prestressing force assembled beam-column node beam-ends welds stirrup construction and installation method |
| CN109868937A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The prestressed concrete superposed beam and its design of post-tensioning soap-free emulsion polymeization, construction method |
| CN110017035A (en) * | 2019-05-08 | 2019-07-16 | 福州大学 | A kind of precast prestressed bean column node method and structure of mixed-fiber reinforced concrete reinforcing |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105926771A (en) * | 2016-06-17 | 2016-09-07 | 中国十七冶集团有限公司 | Middle joint connecting structure of assembled integral frame column-beam and construction method of middle joint connecting structure |
| CN106149877B (en) * | 2016-06-23 | 2018-06-05 | 宁波普利凯建筑科技有限公司 | Concrete frame structure prefabricated post and the docking structure and method at beam slab node |
| CN106149878A (en) * | 2016-06-23 | 2016-11-23 | 宁波普利凯建筑科技有限公司 | Attachment structure at concrete frame structure prefabricated post and beam slab node and method |
| CN106149878B (en) * | 2016-06-23 | 2018-06-05 | 宁波普利凯建筑科技有限公司 | Concrete frame structure prefabricated post and the connection structure and method at beam slab node |
| CN109868937A (en) * | 2017-12-05 | 2019-06-11 | 上海同吉建筑工程设计有限公司 | The prestressed concrete superposed beam and its design of post-tensioning soap-free emulsion polymeization, construction method |
| CN108265824A (en) * | 2018-01-24 | 2018-07-10 | 西安建筑科技大学 | A kind of high ductility concrete beam and column node of assembled and connection method |
| CN108035438A (en) * | 2018-01-24 | 2018-05-15 | 西安建筑科技大学 | A kind of concrete assembled frame structure system of high-strength high ductility and connection method |
| CN108019000A (en) * | 2018-01-24 | 2018-05-11 | 西安建筑科技大学 | A kind of high-strength high ductility concrete of assembled exempts from sleeve connection structure and connection method |
| CN108824637A (en) * | 2018-05-23 | 2018-11-16 | 王昆 | A kind of precast prestressed assembled beam-column node |
| CN108824637B (en) * | 2018-05-23 | 2020-04-03 | 广州机施建设集团有限公司 | Prefabricated prestressing force assembled beam column node |
| CN108867858A (en) * | 2018-06-08 | 2018-11-23 | 中国建筑股份有限公司 | Prestressing force assembled beam-column node beam-ends welds stirrup construction and installation method |
| CN108755929A (en) * | 2018-06-22 | 2018-11-06 | 重庆大学 | A kind of assembled pre-tensioned prestressed concrete frame and its construction technology |
| CN108661171A (en) * | 2018-07-03 | 2018-10-16 | 江苏南通二建集团有限公司 | A kind of prefabricated assembled concrete frame joint connection structure |
| CN110017035A (en) * | 2019-05-08 | 2019-07-16 | 福州大学 | A kind of precast prestressed bean column node method and structure of mixed-fiber reinforced concrete reinforcing |
| CN110017035B (en) * | 2019-05-08 | 2023-12-01 | 福州大学 | Method and structure for reinforcing precast prestressed beam and column joints by mixed fiber concrete |
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